having a problem with my hsn backing itself out while driving the car. just wondering if i could get a O ring from the hardware store since i ordered the main housing from my local hobby store and i told them what the problem was and i didnt know that the needle and seal was separate.(LHS SUX) Thanx in advance for any help!!!!!!

I'd call Nitrohouse first and get what is spec'ed for the engine. Ofna sells just the o'rings for any Ofna engine. You'll probably spend hours going from Hardware store to store trying to find one that will fit properly, and if it's not for high temps it'll melt in the needle housing.